Bring your hunting license with you, in case the game warden shows up. They will ask you if you have a hunting license or range permit.
Preferably don't go alone, for safety.
Hang one target and do not continually go down range to check it. PGC ranges are notorious for people firing when others are down range. For this and several other reasons, I stopped going to the PGC range near me and joined a local club.